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Carbon nanotubes as photoprotectors of organic dyes: reversible photoreaction instead of permanent photo-oxidation.

Long, Dewu LU ; Lin, Hongzhen LU and Scheblykin, Ivan LU (2011) In Physical chemistry chemical physics : PCCP 13. p.5771-5777
Abstract
In this paper we report that single-walled carbon nanotubes (SWNTs) can protect surface adsorbed Rhodamine B (RhB) molecules from permanent photo-oxidation via a reversible reaction. Upon strong light irradiation at 514 nm, the SWNT-adsorbed RhB molecules were switched to a non-fluorescent form, which looked like ordinary bleaching behavior. However, after staying without light for several hours the non-fluorescent dye species turned back to the original fluorescent form. This on/off switching can be considered as a reversible photobleaching process of the dye molecules. Other irreversible photochemical pathways of RhB were strongly prohibited due to the presence of SWNTs, providing the dye molecules with a high resistance against... (More)
In this paper we report that single-walled carbon nanotubes (SWNTs) can protect surface adsorbed Rhodamine B (RhB) molecules from permanent photo-oxidation via a reversible reaction. Upon strong light irradiation at 514 nm, the SWNT-adsorbed RhB molecules were switched to a non-fluorescent form, which looked like ordinary bleaching behavior. However, after staying without light for several hours the non-fluorescent dye species turned back to the original fluorescent form. This on/off switching can be considered as a reversible photobleaching process of the dye molecules. Other irreversible photochemical pathways of RhB were strongly prohibited due to the presence of SWNTs, providing the dye molecules with a high resistance against permanent photodegradation. By determining the maximum number of reconvertable RhB molecules per unit length of the nanotubes, we have further proved that this effect only works for the first layer of adsorbed dye molecules on the SWNT surfaces. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical chemistry chemical physics : PCCP
volume
13
pages
5771 - 5777
publisher
Royal Society of Chemistry
external identifiers
  • wos:000288447100035
  • pmid:21321723
  • scopus:79952722116
ISSN
1463-9084
DOI
10.1039/c0cp02764b
language
English
LU publication?
yes
id
3ea9f816-3bf6-4936-8307-33b2f67ea7b2 (old id 1831840)
date added to LUP
2011-03-03 17:48:24
date last changed
2017-01-01 05:32:16
@article{3ea9f816-3bf6-4936-8307-33b2f67ea7b2,
  abstract     = {In this paper we report that single-walled carbon nanotubes (SWNTs) can protect surface adsorbed Rhodamine B (RhB) molecules from permanent photo-oxidation via a reversible reaction. Upon strong light irradiation at 514 nm, the SWNT-adsorbed RhB molecules were switched to a non-fluorescent form, which looked like ordinary bleaching behavior. However, after staying without light for several hours the non-fluorescent dye species turned back to the original fluorescent form. This on/off switching can be considered as a reversible photobleaching process of the dye molecules. Other irreversible photochemical pathways of RhB were strongly prohibited due to the presence of SWNTs, providing the dye molecules with a high resistance against permanent photodegradation. By determining the maximum number of reconvertable RhB molecules per unit length of the nanotubes, we have further proved that this effect only works for the first layer of adsorbed dye molecules on the SWNT surfaces.},
  author       = {Long, Dewu and Lin, Hongzhen and Scheblykin, Ivan},
  issn         = {1463-9084},
  language     = {eng},
  pages        = {5771--5777},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical chemistry chemical physics : PCCP},
  title        = {Carbon nanotubes as photoprotectors of organic dyes: reversible photoreaction instead of permanent photo-oxidation.},
  url          = {http://dx.doi.org/10.1039/c0cp02764b},
  volume       = {13},
  year         = {2011},
}